package online.forgame.wechat_pay.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import online.forgame.wechat_pay.domain.User;

import java.util.Date;

public class JwtUtils {
    private JwtUtils() {
    }

    //发布单位
    private static final String SUBJECT = "online.forgame";
    //过期时间，毫秒，一周
    private static final long EXPIRE = 1000 * 60 * 60 * 24 * 7;
    //秘钥
    private static final String APPSECRET = "alice";

    /**
     * 生成Token
     */
    public static String geneJsonWebToken(User user) {
        if (user == null || user.getId() == null || user.getName() == null
                || user.getHeadImg() == null) {
            return null;
        }
        String token = Jwts.builder().setSubject(SUBJECT)
                .claim("id", user.getId())
                .claim("name", user.getName())
                .claim("img", user.getHeadImg())
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))
                .signWith(SignatureAlgorithm.HS256, APPSECRET).compact();
        return token;
    }

    /**
     * 校验Token
     */
    public static Claims checkJWT(String token) {
        try {
            final Claims claims = Jwts.parser().setSigningKey(APPSECRET).
                    parseClaimsJws(token).getBody();
            return claims;
        } catch (Exception e) {
            return null;
        }
    }
}
